feat: 添加双屏控制功能，更新相关逻辑以支持双屏窗口全屏展示；新增全局错误边界组件以处理渲染错误

src-tauri/src/lib.rs

@@ -24,15 +24,17 @@ fn set_dual_screen(app: AppHandle, on: bool) -> Result<String, String> {
         let _ = w.set_focus();
         return Ok("on".into());
     }
-    let mut builder = WebviewWindowBuilder::new(&app, "secondary", WebviewUrl::App("/".into()))
+    let mut builder = WebviewWindowBuilder::new(&app, "secondary", WebviewUrl::default())
         .title("OPC 运营中心 · 双屏");
     // 定位到第二块屏（非主屏；无第二屏则用第一块）
     if let Ok(monitors) = app.available_monitors() {
+        eprintln!("[dual] available_monitors={}", monitors.len());
         let primary_pos = app
             .primary_monitor()
             .ok()
             .flatten()
             .map(|pm| { let p = pm.position(); (p.x, p.y) });
+        eprintln!("[dual] primary_pos={:?}", primary_pos);
         let target = monitors
             .iter()
             .find(|m| { let p = m.position(); Some((p.x, p.y)) != primary_pos })
@@ -40,11 +42,18 @@ fn set_dual_screen(app: AppHandle, on: bool) -> Result<String, String> {
         if let Some(mon) = target {
             let p = mon.position();
             let s = mon.size();
+            eprintln!("[dual] target {}x{} @ {},{}", s.width, s.height, p.x, p.y);
             builder = builder.position(p.x as f64, p.y as f64).inner_size(s.width as f64, s.height as f64);
         }
     }
     let win = builder.build().map_err(|e| e.to_string())?;
-    let _ = win.set_fullscreen(true);
+    // 等窗口内容就绪后再全屏（避免过早全屏导致白屏/布局异常）
+    let win2 = win.clone();
+    std::thread::spawn(move || {
+        std::thread::sleep(std::time::Duration::from_millis(400));
+        let _ = win2.set_fullscreen(true);
+        let _ = win2.set_focus();
+    });
     Ok("on".into())
 }